        APOD: 2018 February 5 - NGC 7635: The Bubble Nebula Expanding

                         Astronomy Picture of the Day

    Discover the cosmos! [1] Each day a different image or photograph of our
 fascinating universe is featured, along with a brief explanation written by a
                           professional astronomer.

                                2018 February 5
                                      [2]
                    NGC 7635: The Bubble Nebula Expanding
      Image Credit [3] : Gran Nilsson [4]  & The Liverpool Telescope [5]

Explanation: It's the bubble versus the cloud. NGC 7635, the Bubble Nebula [6]
, is being pushed out by the stellar wind [7] of massive star BD+602522 [8] ,
visible in blue toward the right, inside the nebula. Next door, though, lives
a giant molecular cloud [9] , visible to the far right in red. At this place
in space, an irresistible force [10]  meets an immovable object [11]  in an
interesting way. The cloud [12]  is able to contain the expansion of the
bubble gas, but gets blasted by the hot radiation from the bubble [13] 's
central star. The radiation [14]  heats up dense regions of the molecular
cloud [15]  causing it to glow. The Bubble Nebula [16] , pictured here [17]
is about 10 light-years [18] across and part of a much larger complex [19]  of
stars and shells. The Bubble Nebula [20] can be seen with a small telescope
towards the constellation [21]  of the Queen of Aethiopia [22]  ( Cassiopeia
[23] ).

                  Tomorrow's picture: galaxy of shells [24]

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Site notes:
  [1] archivepix.html
  [2] image/1802/Bubble_LiverpoolNilsson_1679.jpg
  [3] https://creativecommons.org/licenses/by-sa/4.0/deed.en
  [4] https://www.astrobin.com/users/gorann/
  [5] http://telescope.livjm.ac.uk/
  [6] ap091030.html
  [7] ap000318.html
  [8] http://adsabs.harvard.edu/abs/2002AJ....124.3305M
  [9] ap171008.html
  [10] http://en.wikipedia.org/wiki/Irresistible_force_paradox
  [11]
http://1.bp.blogspot.com/-s8wPzTQVHwk/TZ23dhVwPTI/AAAAAAAAARY/1SsZ9s_A_J4/
s1600/big+pumpkin.jpg
  [12] http://heritage.stsci.edu/1998/31/index.html
  [13] http://www.exploratorium.edu/ronh/bubbles/bubbles.html
  [14] http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html
  [15] http://en.wikipedia.org/wiki/Molecular_cloud
  [16] ap030617.html
  [17]
https://commons.wikimedia.org/wiki/
File:Bubble_Nebula_NGC7635_Goran_Nilsson_%26_The_Liverpool_Telescope.jpg
  [18] http://chandra.harvard.edu/photo/cosmic_distance.html
  [19] ap171026.html
  [20] ap170531.html
  [21]
http://www.astro.wisc.edu/~dolan/constellations/extra/constellations.html
  [22] https://en.wikipedia.org/wiki/Aethiopia
  [23] http://www.hawastsoc.org/deepsky/cas/
  [24] ap180206.html
  [25] ap180204.html
  [26] archivepix.html
  [27] lib/apsubmit2015.html
  [28] lib/aptree.html
  [29] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  [30] calendar/allyears.html
  [31] /apod.rss
  [32] lib/edlinks.html
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  [34] http://asterisk.apod.com/discuss_apod.php?date=180205
  [35] ap180206.html
  [36] http://www.phy.mtu.edu/faculty/Nemiroff.html
  [37] http://www.phy.mtu.edu/
  [38] https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
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